Hood decals should be blue with long A and S. Besides, I think that looks better.
I respecfully disagree that ALL the rear rims of Bs and Cs were either galvanized or silver. Perhaps many were, it's a common response to such a question, however I have seen Bs with quite obviously the original paint that still have traces of remaining orange on the rear rims. Here's a quote from the booklet "The Little ACs" available from this site:
"Colors for rear wheels varied over the years with the early models using black rims and orange for the wheels. The C and B were produced with orange rims for much of the 40s. With the advent of the WD, AC began to use Silver for the B and CA rear rims. This occurred at the start of the 50s. Based on our research, the C was never produced with silver rims."
I painted my '42B rear rims the early persian orange color, not particulalrly because it may have been "correct", but because I much prefer the appearance:
It's your tractor, paint the rims whatever color you prefer. As far as I'm concerned, if it's black, early persian orange, silver or actually galvanized, nobody can say you are wrong with any certainty.